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Optical, Photocatalytic and Wetting Behavior of GLAD N 2 ‐TiO 2 Films
Author(s) -
De Rajnarayan,
Haque S. Maidul,
Misal Jitendra S.,
Shinde Deepak D.,
Prathap Chilakala,
Polaki Shyam R.,
Singh Ranveer,
Som Tapobrata,
Rao K. Divakar
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900021
Subject(s) - materials science , doping , contact angle , wetting , photocatalysis , transmittance , surface roughness , analytical chemistry (journal) , deposition (geology) , refractive index , band gap , composite material , optics , optoelectronics , chemistry , chromatography , paleontology , biochemistry , physics , sediment , biology , catalysis
E‐beam evaporated N 2 ‐doped TiO 2 vertical nanowires are fabricated using glancing angle deposition technique. Doping is carried out during the deposition process by external supply of N 2 gas at different flow rates viz. 0, 5, 10, 20 sccm. The effect of doping concentration on various properties of the coatings is studied in detail. Refractive index value is found to be increased from 1.374 to 1.604 with increase in N 2 flow rate into the deposition chamber. Simultaneous reduction in average film transmittance (≈95–≈92%) is also observed in the visible wavelength range. Substantial reduction in optical band gap (3.85–3.43 eV) value of the coating is also noted. Surface structure of the coatings is also found to be strongly dependent on doping concentration. Samples prepared with highest doping percentage is found to have lowest RMS roughness (≈2.3 nm), void percentage (≈22%), and agglomerated grain structures. Water wetting study reveals increase in water contact angle of the samples with N 2 doping. All the samples are found to be photocatalytic in nature with improved efficiency of doped samples.